<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<title></title>
		<link rel="stylesheet" href="./Bootstrap4.6.1/css/bootstrap.css">
		<!-- 先引入jquery文件，再引入bootstrap文件 -->
		<script src="./Bootstrap4.6.1/js/jquery.js"></script>
		<script src="./Bootstrap4.6.1/js/bootstrap.bundle.js"></script>
		<style>
			div{
				outline: 1px red solid;
			}
		</style>  
		<!-- 12  4  3-->
	</head>
	<body>
		<div class="container">
			<!-- 大屏一行4，中屏一行3，小一行2 -->
			<div class="row">
				<div class="col-lg-3 col-md-4 col-6">01</div>
				<div class="col-lg-3 col-md-4 col-6">02</div>
				<div class="col-lg-3 col-md-4 col-6">03</div>
				<div class="col-lg-3 col-md-4 col-6">04</div>
				<div class="col-lg-3 col-md-4 col-6">05</div>
				<div class="col-lg-3 col-md-4 col-6">06</div>
				<div class="col-lg-3 col-md-4 col-6">07</div>
				<div class="col-lg-3 col-md-4 col-6">08</div>
				<div class="col-lg-3 col-md-4 col-6">09</div>
				<div class="col-lg-3 col-md-4 col-6">10</div>
				<div class="col-lg-3 col-md-4 col-6">11</div>
				<div class="col-lg-3 col-md-4 col-6">12</div>
				<div class="col-lg-3 col-md-4 col-6">13</div>
				<div class="col-lg-3 col-md-4 col-6">14</div>
				<div class="col-lg-3 col-md-4 col-6">15</div>
			</div>
		</div>
	</body>
</html>